/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.validation.client;

/**
 * Defines a logic to validate the values that retrieved from client input fields. For single
 * fields, the values just has one element, for multi-field inputs this values is the real 'values'.
 * 
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public abstract class Validation {
  protected String[] groups;

  /**
   * Creates a validation with the given groups.
   * 
   * @param groups the groups
   */
  public Validation(String... groups) {
    this.groups = groups;
  }

  /**
   * Validates the given value(s).
   * 
   * @param values the value(s) to be validated.
   * @return an error message for invalid or null for valid
   */
  abstract protected String validate(Object[] values);
}
